The OVZ got a face lift too when they switched to the new hinge design. The current OVZ top housing isn't the same as the OVH from what i see. (unless the OVH/G got the newer sharp profile as well).
Actually the OVH and OVG have the same housing as the OVZ. I look at both my OVZ and OVH, they have a nearly identical design except the hinges are different. Other than the hinges the housings are exactly the same.
HERE IS ONE Close up that he took a picture of when the light was on the ground. A bit ripped... But you can see what is on one of those tags.